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2012-02-15 11:16 pm

In theory, the intensity of brightness of fringes produced by double-slit interference are equally distributed. In practice, However, it is observed that the central fringes is he brightest.

?? Why

回答 (1)

天同

2012-02-16 1:22 am

✔ 最佳答案

No. It is not true. The fringes arising from double-slit interference are of non-uniform brightness.

You could refer to the following web-page, which gives an equation for the intensity of the interference pattern. In fact, the intensity of fringes varies with a complex sine fucntion.

http://vnatsci.ltu.edu/s_schneider/physlets/main/doubleslitintensity.shtml

The fringe intensity (or brightness) is about uniform only when the slit width a is much much smaller than the 入, wavelength of light used.

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